/*
 * Copyright 2002-2014 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.test.context.transaction.ejb.dao;

import org.springframework.test.context.transaction.ejb.model.TestEntity;

import javax.ejb.TransactionAttribute;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

/**
 * Abstract base class for EJB implementations of {@link TestEntityDao} which
 * declare transaction semantics for {@link #incrementCount(String)} via
 * {@link TransactionAttribute}.
 *
 * @author Sam Brannen
 * @author Xavier Detant
 * @see RequiredEjbTxTestEntityDao
 * @see RequiresNewEjbTxTestEntityDao
 * @since 4.0.1
 */
public abstract class AbstractEjbTxTestEntityDao implements TestEntityDao {

    @PersistenceContext
    protected EntityManager entityManager;


    protected final TestEntity getTestEntity(String name) {
        TestEntity te = entityManager.find(TestEntity.class, name);
        if (te == null) {
            te = new TestEntity(name, 0);
            entityManager.persist(te);
        }
        return te;
    }

    protected final int getCountInternal(String name) {
        return getTestEntity(name).getCount();
    }

    protected final int incrementCountInternal(String name) {
        TestEntity te = getTestEntity(name);
        int count = te.getCount();
        count++;
        te.setCount(count);
        return count;
    }

}
